Poloniex exchange is a crypto exchange based in San Fransisco, US. It supports trading in more than 200 cryptocurrency pairs. Thats a very large number.
One can easily sign up on the platform since it only require name, email and country of residence.
It uses a proprietary web based platform with user friendly design with multiple integrated indicators.
It has a high market capitalization and high daily volume. This is owing to the wide array of currencies it trades. However it doesn't support any flat Currency.